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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
To keep it one-lined, I could have written a recursive function to divide by 2 and count the remainders, but was it really necessary ;)?
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If that so the author should've written tests for that.